How to define main method to run Java program?

Question

I want to run following code in Eclipse as Java Application and it requires main method to define. At all tries to do it myself was receiving a message:

method TemperatureNormalizer() is undefiened for the type TemperatureNormalizer

Could you please help me to write it correctly?

import java.util.Arrays;
public class TemperatureNormalizer {
   private double[] data;

   public TemperatureNormalizer(double[] list) {
       data = list;
   }

   public static void main(String[] args) {
       TemperatureNormalizer();
   }

   public double getAdjustedAverage() {
       double max = getMax();
       double min = getMin();
       double sum = getSum();

       int insertAt = 0;

       for (int i = 0; i < data.length; i++) {

           if (data[i] == max || data[i] == min) {
               for (int j = i; j > insertAt; j--) { 
                   data[j] = data[j - 1];
               }
               data = Arrays.copyOf(data, data.length - 1);
           }    
       }
       return (sum - max - min) / data.length;
   }

   public double getMax() {
        double current = 0;
        for (int i = 0; i < data.length; i++) {
            if (data[i] > current) {
                current = data[i];
            }
        }
        return current;
    }

    public double getMin() {
        double current = data[0];
        for (int i = 0; i < data.length; i++) {
            if (data[i] < current) {    
                current = data[i];  
            }   
        }
        return current;
    }

    public double getSum() {
        double sum = 0;
        for (double d : data) {
            sum = sum + d;
        }
        return sum;
    }
}

You need to construct the instance of TemperatureNormalizer , so in the main method add TemperatureNormalizer temperatureNormalizer = new TemperatureNormalizer(); then on a new line call the methodtemperatureNormalizer .getAdjustedAverage() — Kenneth Clark
– Kenneth Clark, Commented May 13, 2015 at 12:16

Z3ph1r · Accepted Answer · 2015-05-13 12:18:58Z

1

In your main method, initialize your object with: TemperatureNormalizer temperatureNormalizer = new TemperatureNormalizer ();

Also, your class TemperatureNormalizer has a constructor which expects an array of Double. Either give an array in your main method or create an extra constructor that doesn't take a parameter.

public TemperatureNormalizer()
{
  // do stuff (or not)
}

answered May 13, 2015 at 12:18

Z3ph1r

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1 Comment

vehk Over a year ago

Thank you guyes, for your help

Paul · Accepted Answer · 2015-05-13 12:34:35Z

0

You should create a test class (for example) which will contain all your actions:

class Test{
    public static void main (String[] args){
        TemperatureNormalizer temperatureNormalizer = new TemperatureNormalizer();
   }  
}

If all your classes are in the same folder the compiler will have no problem.

answered May 13, 2015 at 12:34

Paul

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Comments

Balasubramanian · Accepted Answer · 2015-05-13 12:38:59Z

0

You need to create Object of the class in the main method. Already you have created Parameterized constructor, so the compiler won't create a default constructor. You have to code for that.
```
public TempratureNormalizer(){
 // implementation here...
}

TempratureNormalizer TempNorm = new TempratureNormalizer();
```

If you're calling Parameterized constructor that is

TempratureNormalizer(double[] list)

then the main method should be

double[] list = {2.0,3.45,1.09} // give your dynamic values
TempratureNormalizer TempNorm = new TempNormailzer(list);

edited May 13, 2015 at 12:38

answered May 13, 2015 at 12:33

Balasubramanian

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Comments

Madhusudan · Accepted Answer · 2015-05-13 13:03:25Z

0

If you just want to run this program then change main method in the program as below:

public static void main(String[] args) {
       double  a1[] = {1,2,3,4};
       TemperatureNormalizer temp = new TemperatureNormalizer(a1);
       System.out.println("Avg:" + temp.getAdjustedAverage());
   }

It will give output:

Avg: 1.6666666666666667

answered May 13, 2015 at 13:03

Madhusudan

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2 Comments

vehk Over a year ago

Are there any simplier ways to make run configuration in eclipse for the program, which has no main method?

Madhusudan Over a year ago

you need main method to run your Java Program. Its not possible to run without main method because execution will start from main method only.

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